High diastolic blood pressure in pregnant women in mid-pregnancy may be due to nervousness or gestational hypertension, which requires relaxation, ensuring adequate sleep, and using nifedipine for antihypertensive treatment if necessary. When pregnant women are nervous, there may be a temporary increase in blood pressure, then pregnant women need to release the pressure, to ensure a happy mood, regular work and rest, to ensure adequate sleep, the symptoms of elevated diastolic blood pressure may be relieved. If a pregnant woman in the middle of pregnancy develops hypertensive disorders of pregnancy, it may also cause an increase in diastolic blood pressure. In this case, the pregnant woman should eat a light diet, ensure adequate sleep, and if necessary, use nifedipine to lower blood pressure. Nifedipine may cause headache, edema and other adverse reactions in pregnant women, and should be used under the guidance of a doctor. If a pregnant woman in the middle of pregnancy has blurred vision and foamy urine along with elevated diastolic blood pressure, she needs to go to the hospital in time for a comprehensive and systematic examination to prevent the occurrence of pre-eclampsia or eclampsia. Pay attention to monitoring blood pressure and pay more attention to rest.